A seleção natural nos hominídeos

quinta-feira, novembro 03, 2016

Natural Selection in the Great Apes

Alexander Cagan†,1, Christoph Theunert†,1,2, Hafid Laayouni†,3,4, Gabriel Santpere†,3,5, Marc Pybus3, Ferran Casals6, Kay Prüfer1, Arcadi Navarro3,7, Tomas Marques-Bonet3,7, Jaume Bertranpetit‡,3,8 and Aida M. Andrés*,‡,1

- Author Affiliations

1Department of Evolutionary Genetics, Max Planck Institute for Evolutionary Anthropology, Leipzig, Germany

2Department of Integrative Biology, University of California, Berkeley, Berkeley, California

3Departament de Ciencies Experimentals i de la Salut, Institut de Biologia Evolutiva, Universitat Pompeu Fabra, Barcelona, Catalonia, Spain

4Departament de Genètica i de Microbiologia, Universitat Autonòma de Barcelona, Bellaterra, Barcelona, Catalonia, Spain

5Department of Neuroscience, Yale University School of Medicine, New Haven, Connecticut

6Genomics Core Facility, Departament de Ciencies Experimentals i de la Salut, Universitat Pompeu Fabra, Barcelona, Catalonia, Spain

7Institució Catalana de Recerca i Estudis Avançats (ICREA), Barcelona, Catalonia, Spain

8Department of Archaeology and Anthropology, Leverhulme Centre for Human Evolutionary Studies, University of Cambridge, Cambridge, United Kingdom

↵*Corresponding author: E-mail: aida_andres@eva.mpg.de.


Natural selection is crucial for the adaptation of populations to their environments. Here, we present the first global study of natural selection in the Hominidae (humans and great apes) based on genome-wide information from population samples representing all extant species (including most subspecies). Combining several neutrality tests we create a multi-species map of signatures of natural selection covering all major types of natural selection. We find that the estimated efficiency of both purifying and positive selection varies between species and is significantly correlated with their long-term effective population size. Thus, even the modest differences in population size among the closely related Hominidae lineages have resulted in differences in their ability to remove deleterious alleles and to adapt to changing environments. Most signatures of balancing and positive selection are species-specific, with signatures of balancing selection more often being shared among species. We also identify loci with evidence of positive selection across several lineages. Notably, we detect signatures of positive selection in several genes related to brain function, anatomy, diet and immune processes. Our results contribute to a better understanding of human evolution by putting the evidence of natural selection in humans within its larger evolutionary context. The global map of natural selection in our closest living relatives is available as an interactive browser at http://tinyurl.com/nf8qmzh.

Key words: evolution adaptation comparative genomics primates

© The Author 2016. Published by Oxford University Press on behalf of the Society for Molecular Biology and Evolution.

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